Are we allowed to work on a three-month entry visa?
As far as I know, if you’re looking for an official job you can wait for 3 months to start one in a company. Because the interview process will take the 1 to 1.5 months for you. But if you’re just looking for odd jobs than it shouldn’t be a problem.
The only thing is that if you’re paid less than 450 euros per month than the government doesn’t charge any taxes on your income. Hence you’re good to go with the 3 month visa also.